Drawing apparatus



C. MULLER.

DRAWING APPARATUS.

APPLICATION man ^ue`.1.1921.

1,406,061. Patented Feb. 7, 1922.

[Javea/baz www UNITED s TA'rgEs PATENToFFlcE.

CHARLES MULLER, OF ZURICH, SWITZERLAND.

- DRAWING APPARATUS.

Original application nled April 2, 1920, Serial No. 370,694. Divided andthis application filed 1921. Serial No. 489,015.

To all 'whom t may concern:

Be it known that I, CHARLES MULLER, a

citizen of the Republic of Switzerland, re-

siding at Zurich, Switzerland, have invented certain new and usefulImprovements in Drawing Apparatus, and do hereby declare the followingto be a clear, full, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same,`ref erence being had to the accompanying draw.- ings, andto letters or figures of reference marked thereon, which form a part ofthis specification.

Thisv invention relates to drawing apparatus 0f the ty|pe wherein twolinks are provided parallel to each other and adapted to act as parallelguide for square, rules and the like.

The object of the present inventionis to improve and simplify suchapparatus.

To this end the apparatus according to the invention comprises at leastone heavy roller-like transporting means adapted to travel over theplane of a drawing vand which is mounted in a stirrup. Two parallellinks are connected by pin joints with their one ends to said stirrupand with their other ends to a disc, the latter being provided withmeans for securing squares, rules and the like thereto.

This application forms a division of my copending application Ser. No.370694, filed April 2nd, 1920.

Several constructional examples of the invention are shown in theaccompanying drawings, in which:

Fig. 1 is a plan view of a first example partly shown in section.

Fig. 2 is a section along line E-F of Fig. 1.

Fig. 3 shows a modification of a detail.

Fig. 4 is a plan view of another modied construction and Fig. 5 is asection on line G-H of Fig. 4.

Referring to the first constructional example of the apparatusillustrated in Figs. 1 and 2, the means which adapt the apparatus totravel over the plane of a drawing consists of two rollers 31 fixed tothe ends of an axle 30. The treads of the rollers 31 are roughened andthe rollers are of heavy weight, the latter may be attained either bydimensioning the rollers amply, or by making them of a heavy material orby Specification of Letters Patent.

Patented Feb. *7, .1922. August '1,

filling them with heavy material. The axley l 30 isy rotatably carriedina bush 28 and secured against axial displacement by means ofy a setscrew 29 entering into a circular groove of the axle. A stirrup likemember 1*L is connected to the axle carrying the rolln ers by means ofbearings 27 in which said bush 28 is fixed. To the fiat portion of thestirrup-like member the one ends of the two links 11 are connected bypin joints whilst their other ends are connected in the same manner to adisc 12. Thisl disc 12 carries a square 16 by means of a bracket 15which is adjustable into any position around the centre of the disc. Inthe centre of the disc a knob 22 is provided and by moving the knob byhand the square 16 may be moved in any direction over the plane of thedrawing and during such movement the links 11 will always remainparallel to e-ach other and likewise all the positions of the square 16will be'parallel to each other.

The modification according to Fig. 3 shows the arrangement of avsingle'roller 31a instead of the two rollers 31 shown in the previouslydescribed example, the outer ends of roller 31a being rotatably carriedin bearings 271. 32 designates a set screw by which the rotation of theroller 31a in the bearing can be stopped. This set screw 32 correspondsto the set screw 32L provided for the same purpose in the example shownin Figs. 1 and'2.

The feature of the modification shown in Fig. 4 consists in theprovision of clamping screws 34 for stopping the turning motion of thelinks 11 about the pins 33. Further in this arrangement knob 22, discA12 and bracket 15 are provided with a bore to take up a drawing pencil,which is held in position by set screw 36. Tightening the clamping screw34 enables to draw horizontal parallel lines with said drawing pencil bycausing the rollers 31 to move along the drawing.

clalm 1. In a drawing apparatus, the combination of at least one heavy,roller-like means, a stirrup-like member for mounting said meansthereon, a disc, two parallel links pivotally connected to said stirrupmember and disc, and means to secure a straight edge or the like forguiding a drawing utensil to said disc.

2. In a drawing apparatus, the combination of at least one heavy,roller-like means adapted to allow 0f the travelling a sleeve arrangedon said axle between said Ytwo rollers, a stirrup-like memberoperatively connected tosaid sleeve, a rotatable connection between saidrollers and said stirrup-like member, a disc, two parallel linkspivotally connected to' said stirrup member and disc, and means tosecure a straight edge or the like for guiding adrawing utensil tosaiddisc. l

In testimony that I claim the foregoing as my invention, Ihave signed myname.V

CHARLES MULLER.

